Dr. Lieselotte Obst-Huebl Profile

Dr. Lieselotte Obst-Huebl

Doctoral Candidate at Lawrence Berkeley National Lab

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Publications (6)

Proceedings Article | 3 October 2023 Open Access

High power commissioning of BELLA iP2 up to 17 J (Erratum)

L. Obst-Huebl, K. Nakamura, S. Hakimi, J. De Chant, A. Jewell, B. Stassel, A. Snijders, A. Gonsalves, J. van Tilborg, Z. Eisentraut, Z. Harvey, L. Willingale, Cs. Toth, C. Schroeder, C. G. Geddes, E. Esarey

Proceedings Volume 12583, 1258308 (2023) https://doi.org/10.1117/12.3012874

KEYWORDS: Gaussian pulse, Pulsed laser operation, Particles, Signal attenuation, Laser energy, Ions, Astatine, Phase measurement, Optoelectronics, Ion lasers

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Proceedings Article | 9 June 2023 Presentation

Transient laser-induced breakdown of dielectrics in ultra-relativistic laser-solid interactions (Conference Presentation)

Constantin Bernert, Stefan Assenbaum, Stefan Bock, Florian-Emanuel Brack, Thomas Cowan, Chandra Curry, Marco Garten, Lennart Gaus, Maxence Gauthier, René Gebhardt, Sebastian Göde, Siegfried Glenzer, Uwe Helbig, Thomas Kluge, Stephan Kraft, Florian Kroll, Lieselotte Obst-Huebl, Thomas Pueschel, Martin Rehwald, Hans-Peter Schlenvoigt, Christopher Schönwälder, Ulrich Schramm, Franziska Treffert, Milenko Vescovi, Tim Ziegler, Karl Zeil

Proceedings Volume PC12579, PC125790U (2023) https://doi.org/10.1117/12.2665586

KEYWORDS: Laser induced damage, Laser induced breakdown spectroscopy, Dielectrics, Solids, Pulsed laser operation, Laser damage threshold, Plasma, Laser applications, Ionization, Hydrogen

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Proceedings Article | 8 June 2023 Presentation + Paper

High power commissioning of BELLA iP2 up to 17 J

Proceedings Volume 12583, 1258305 (2023) https://doi.org/10.1117/12.2669162

KEYWORDS: Pulsed laser operation, Laser energy, Laser radiation, Vacuum chambers, Reflection, Ion beams, High power lasers, Ions, Diagnostics, Pulse signals

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Proceedings Article | 18 April 2021 Presentation

Radiobiological studies with laser-driven protons at the BELLA PW

Lieselotte Obst-Huebl, Jianhui Bin, Jian-Hua Mao, Laura Geulig, Hang Chang, Kei Nakamura, Qing Ji, Jared De Chant, Anthony Gonsalves, Li He, Stepan Bulanov, Carl Schroeder, Cameron Geddes, Blake Simmons, Thomas Schenkel, Eleanor Blakeley, Antoine Snijders, Sven Steinke, Eric Esarey

Proceedings Volume 11790, 117900B (2021) https://doi.org/10.1117/12.2596505

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We established an experimental platform for the investigation of the radiobiological effects of stable few-MeV laser-accelerated ions at the BELLA Center using a peak laser pulse intensity of 2x1019 W cm-2 [1]. The focal spot size of laser pulses from the BELLA PW laser system is large compared to that found in typical laser-driven ion beamlines, which resulted in reduced divergence and increased ion numbers [2]. Such beams are ideally suited for subsequent capture and transport with an active plasma lens (APL) [3]. Combined with our high shot rate capability (0.2 Hz), around 1000 shots at ultra-high instantaneous dose rates (0.6 Gy/shot resulting in 107 Gy/s), with a uniform dose distribution over a 1 cm diameter lateral area, could thus be delivered to biological cell sample cups, located in air at 1.7 m distance from the laser-target interaction. The proton beamline was complemented by online (integrating current transformer and scintillator) and offline (radiochromic films) beam diagnostics for dosimetry. This assembly was used to investigate the differential sparing of healthy tissues versus the tumor response under reduced oxygen conditions. This talk gives details on the proton beamline, dosimetry as well as preliminary cell irradiation results. This work is supported by U.S. Department of Energy Office of Science, Offices of High Energy Physics and Fusion Energy Sciences, Contract No. DE-AC02-05CH11231 and LBNL Laboratory Directed Research and Development Grant, PI A. M. Snijders [1] K. Nakamura, et al., Diagnostics, Control and Performance Parameters for the BELLA High Repetition Rate Petawatt Class Laser, IEEE J. Quantum Electron., 53, (2017), 1200121 [2] S. Steinke, et al., Acceleration of high charge ion beams with achromatic divergence by petawatt laser pulses, Phys. Rev. Accel. Beams, 23, (2020), 021302 [3] J. Van Tilborg, et al., Active Plasma Lensing for Relativistic Laser-Plasma-Accelerated Electron Beams, Phys. Rev. Lett., 115, (2015), 184802

Proceedings Article | 14 May 2019 Presentation

Off-harmonic optical probing of high-intensity laser interaction with hydrogen targets using a stand-alone probe laser system (Conference Presentation)

Karl Zeil, Constantin Bernert, Stephan Kraft, Markus Löser, Josefine Metzkes-Ng, Lieselotte Obst-Huebl, Martin Rehwald, Mathias Siebold, Tim Ziegler, Ulrich Schramm

Proceedings Volume 11037, 1103704 (2019) https://doi.org/10.1117/12.2520884

KEYWORDS: Hydrogen, Laser beam diagnostics, Laser systems engineering, Plasma, Cryogenics, Ion beams, Computer simulations, Data conversion, Data analysis, Mode locking

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The development of high-intensity short-pulse lasers in the Petawatt regime offers the possibility to design new compact accelerator schemes by utilizing high-density targets for the generation of ion beams with multiple 10 MeV energy per nucleon. The optimization of the acceleration process demands comprehensive exploration of the plasma dynamics involved, for example via spatially and temporally resolved optical probing. Experimental results can then be compared to numerical particle-in-cell simulations, which is particularly sensible in the case of cryogenic hydrogen jet targets [1]. However, strong plasma self-emission and conversion of the plasma’s drive laser wavelength into its harmonics often masks the interaction region and interferes with the data analysis. Recently, the development of a stand-alone and synchronized probe laser system for off-harmonic probing at the DRACO laser operated at the Helmholtz-Zentrum Dresden–Rossendorf showed promising performance [2]. Here, we present an updated stand-alone probe laser system applying a compact CPA system based on a synchronized fs mode-locked oscillator operating at 1030 nm, far off the plasma’s drive laser wavelength of 800 nm. A chirped volume Bragg grating (Optigrate Corp) is used as a hybrid stretcher and compressor unit. The system delivers 160 fs pulses with a maximum energy of 0.9 mJ. By deploying the upgraded probe laser system in the laser-proton acceleration experiment with the renewable cryogenic hydrogen jet target, the plasma self-emission could be significantly suppressed while studying the temporal evolution of the expanding plasma jet. Recorded probe images resemble those of z-pinch experiments with metal wires and indicate a sausage-like instability along the jet axis, which will be discussed. References [1] L. Obst, et al. Efficient laser-driven proton acceleration from cylindrical and planar cryogenic hydrogen jets. Sci. Rep., 7:10248, 2017. [2] T. Ziegler, et al. Optical probing of high intensity laser interaction with micron-sized cryogenic hydrogen jets. Plasma Phys. Control. Fusion, 2018. doi:10.1088/1361-6587/ aabf4f. [3] C.P. João, et al. Dispersion compensation by two-stage stretching in a sub-400 fs, 1.2 mJ Yb:CaF2 amplifier. Opt. Express, 22:10097–10104, 2014.

Proceedings Article | 14 May 2019 Presentation

All-optical structuring of laser-driven proton beam profiles (Conference Presentation)

Tim Ziegler, Lieselotte Obst-Huebl, Florian-Emanuel Brack, Joao Branco, Michael Bussmann, Thomas Cowan, Chandra Curry, Frederico Fiuza, Marco Garten, Maxence Gauthier, Sebastian Göde, Siegfried Glenzer, Axel Huebl, Arie Irman, Jongjin Kim, Thomas Kluge, Stephan Kraft, Florian Kroll, Josefine Metzkes-Ng, Richard Pausch, Irene Prencipe, Martin Rehwald, Christian Rödel, Hans-Peter Schlenvoigt, Ulrich Schramm, Karl Zeil

Proceedings Volume 11037, 1103707 (2019) https://doi.org/10.1117/12.2520762

KEYWORDS: Pulsed laser operation, Plasma, Ionization, Laser beam propagation, Cryogenics, Hydrogen, Mirrors, Laser interferometry, Interferometry, Collimation

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Extreme field gradients intrinsic to relativistic laser plasma interactions enable compact MeV proton accelerators with unique bunch characteristics. Yet, direct control of the proton beam profile is usually not possible. So far, only complex micro-engineering of the relativistic plasma accelerator itself and limited adoption of conventional beam optics provided access to global beam parameters that define propagation. We present a novel, counter-intuitive all-optical approach to imprint detailed spatial information from the driving laser pulse to the proton bunch. The concept was motivated by an effect initially observed in an experiment dedicated to laser-driven proton acceleration from a renewable micrometer sized cryogenic Hydrogen jet target at the 150 TW Draco laser at HZDR. A compact, recollimating single plasma mirror was used to enhance the temporal laser contrast, which could be monitored on a single-shot base by means of self-referenced spectral interferometry with extended time excursion (SRSI-ETE) at unprecedented dynamic and temporal range. Unexpectedly, the accelerated proton beam profile showed in this experiment prominent features of the collimated laser beam, such as the shadow of obstacles inserted deliberately in the beam. In a series of further experiments, the spatial profile of the energetic proton bunch was found to exhibit identical features as the fraction of the laser pulse passing around a target of limited size. The formation of quasi-static electric fields in the beam path by ionization of residual gas in the experimental chamber results in asynchronous information transfer between the laser pulse and the naturally delayed proton bunch. Such information transfer between the laser pulse and the naturally delayed proton bunch is attributed to the formation of quasi-static electric fields in the beam path by ionization of residual gas. Essentially acting as a programmable memory, these fields provide access to a new level of proton beam manipulation.

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